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19 January, 15:38

What is the solution of ln (x+6) - ln9=2

x=53.50

x=60.50

x=66.50

x=72.50

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Answers (1)
  1. 19 January, 18:12
    0
    Ln (x+6) - ln9=2

    Using ln (a/b) = lna-lnb; with a=x+6 and b=9:

    ln[ (x+6) / 9]=2

    Using ln a=b→a=e^b; with a = (x+6) / 9 and b=2, where e=2.718281828

    (x+6) / 9=e^2

    Solving for x. Multiplying both sides of the equation by 9:

    9[ (x+6) / 9]=9 (e^2)

    x+6=9e^2

    Subtracting 6 both sides of the equation:

    x+6-6=9e^2-6

    x=9e^2-6

    Replacing e=2.718281828

    x=9 (2.718281828) ^2-6

    x=9 (7.389056096) - 6

    x=66.50150486-6

    x=60.50150486

    Rounded to the nearest hundreth:

    x=60.50

    Answer: Second option x=60.50
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